. >>> we're going to start out with the michigan valedictorian on trial for killing his mother. his ex-girlfriend pointed a picture inside the home before the murder. but which side does it help? dan and nancy to weigh in on that. first, abc's john muller. >> reporter: chilling testimony from the ex-girlfriend of a former high school valedictorian, accused of brutally murdering his own mother. >> she believed her medication was sorcery and witchcraft. and therefore, it was evil. >> reporter: holly telling jurors ruth pyne was dangerous and delusional, assaulting her son, jeffrey esh, in the months before she was murdered. >> she had been storing knives in her headboard. she watched the religious channel. >> reporter: prosecutors say 22-year-old jeffrey pyne bludgeoned his mother to death in the family's michigan garage in may of 2011. they claim he was fueled by pent-up rage after years of abuse at the hands of a mentally ill mother. who spent time in jail for abusing him. troubling for the defense, the dramatic blisters on jeffrey pyne's hands. disturbing photos that jurors hav